datacue
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WICG
A TextTrackCue based interface for arbitrary timed metadata, synchronized with audio or video media playback
The specification doesn't seem to define the DataCue constructor steps and argument validation and such.
SEI is useful when we want to render content synchronously with video element, for example: subtitles, trigger for event or animation, body shape mask and so on (you can visit...
Currently, all fields in DataCue.value come directly from the 'emsg' box. However, this pushes ALL work for parsing 'emsg'.message_data onto the application. In some scenarios, it may be valuable for...
This document provides an extended W3C Media Source Extension (MSE) model for the processing of DASH inband events. [DASH-EventProcessing4W3C.docx](https://github.com/WICG/datacue/files/6496754/DASH-EventProcessing4W3C.docx)
DASH emg events may be repeated between media segments, to ensure visibility. Two emsg events are considered equivalent if their `scheme_id_uri`, `value`, and `id` fields are identical. * Do we...
Discussed 17/5/2021 [minutes](https://www.w3.org/2021/05/17-me-minutes.html). It is possible for a DASH event message to have zero duration. When mapped to a DataCue instance, the `startTime` and `endTime` would have the same value....
The [DASH standard](https://www.iso.org/standard/75485.html) section 5.10.3.3.4 says: > `event_duration` provides the duration of the event in media presentation time. [...] The value 0xFFFF indicates an unknown duration. The DASH-IF "DASH Player's...
MSE [`SourceBuffer.remove(start, end)`](https://w3c.github.io/media-source/#dom-sourcebuffer-remove) allows the web application to remove media for a given time range. What should happen to event message boxes that are on the media timeline? * Event...
For DataCue to expose in-band emsg boxes to web applications, the spec would need to define a mapping to the HTML media timeline. See https://github.com/w3c/media-source/issues/189 for discussion. One specific question...
Question from @wolenetz at the [TPAC 2020 meeting on DataCue][1]: Does there need to be feature detection so that web applications can discover which types of UA-generated events are exposed...